I found a list of garden grants that are smallish and some of them can be done by ad-hoc groups.

https://www.thetorocompany.com/community-section

https://karmaforcara.org/microgrant

https://www.gardenclub.org/wildflower-education-grant

https://www.justenergyfoundation.com/Charity-Donation-Funding-Criteria

https://www.seedsavers.org/seed-donation-program?bblinkid=126201225&bbem...

If anyone needs help with grant writing, that's what I do everyday and I'm more than happy to volunteer for a garden project.